All cases of wild poliovirus type 1 reported this week were from Pakistan. In 2014, Pakistan has accounted for 83% of cases reported globally. Khyber Pakhtunkhwa province and the Federally Administered Tribal Areas (FATA) constitute the most heavily infected area of the world, with 73% of cases worldwide occurring within these provinces.
The risk of international spread of polio from Pakistan remains high. The bulk of cases in neighbouring Afghanistan are linked to cross-border transmission with Pakistan, and the outbreak affecting the Middle East originated in Pakistan.